Next-to-leading order QCD predictions for top-quark pair production with up to two jets merged with a parton shower

Abstract

We present differential cross sections for the production of top-quark pairs in conjunction with up to two jets, computed at next-to leading order in perturbative QCD and consistently merged with a parton shower in the Sherpa+OpenLoops framework. Top quark decays including spin correlation effects are taken into account at leading order accuracy. The calculation yields a unified description of top-pair plus multi-jet production, and detailed results are presented for various key observables at the Large Hadron Collider. A large improvement with respect to the multi-jet merging approach at leading order is found for the total transverse energy spectrum, which plays a prominent role in searches for physics beyond the Standard Model.

6 pages, 1 table, 3 figures. Comments on merging scale choice added. Distributions in the kT jet resolution variables added. Decomposition into individual jet multiplicities added. Comments on the uncertainty associated with the 3rd jet emission added. Reduced statistical uncertainties. Accepted for publication in Phys. Lett. B

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